... Auto linkage, one button turn on/off,“system start”and“system end”could link to Projector,screen,and ... Two ways to control projector by SERIAL PORT or infrared, suit for different projector.9. Function of ... on/off, and could set to be “system start” and “system end” linkage in the computer11.Suit for ... plug, The electricity will be cut off when System end, safe and convenient.14.Two line controller ...